contextnest-capture

contextnest-capture is an agent for Claude Code from PromptOwl/ContextNest. It costs 94 tokens per session (1,716 once invoked), scanned A, original, AGPL-3.0.

An agent that saves useful session information—such as facts, decisions, and references—to a Context Nest vault, a stored knowledge collection.

In plain words
What is it for?
Recording durable notes from a coding session through the ctx command-line tool.
Why use it?
It preserves important context so it does not have to be reconstructed from memory later.

Agent for Claude Code

Written for Claude Code: background in frontmatter. Also seen: model in frontmatter.

Part of the contextnest plugin — 1 skill, 3 commands, 3 agents, 4 hooks shipped together

Good fit Recording durable notes from a coding session through the ctx command-line tool.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/promptowl/contextnest/contextnest-capture
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/PromptOwl/ContextNest

Made for: Claude Code.

Or install contextnest, the plugin that ships this one along with the rest of its 1 skill, 3 commands, 3 agents, 4 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for contextnest-capture

README.md
[![agentmods](https://agentmods.dev/badge/agents/promptowl/contextnest/contextnest-capture/github.svg)](https://agentmods.dev/agents/promptowl/contextnest/contextnest-capture)
Your own site
<a href="https://agentmods.dev/agents/promptowl/contextnest/contextnest-capture"><img src="https://agentmods.dev/badge/agents/promptowl/contextnest/contextnest-capture/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for contextnest-capture

Your own site · 80×15
<a href="https://agentmods.dev/agents/promptowl/contextnest/contextnest-capture"><img src="https://agentmods.dev/badge/agents/promptowl/contextnest/contextnest-capture.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 94 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,716 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00094 $0.01716
Opus 5.5 $0.00038 $0.00686
Sonnet 5.5 $0.00019 $0.00343
Haiku 4.5 $0.00009 $0.00172

Measured 7d ago against content hash 625211f6b047, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

contextnest-capture scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/claude-code/agents/contextnest-capture.md · 71 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 7d ago Changed · -57 lines · +17 tokens per session 625211f6b047
  2. 15d ago Changed · +8 lines bbcebdbdb9e3
  3. 29d ago Changed · +7 lines 040107b29a52
  4. 1mo ago Changed · +8 lines aac6f4323533
  5. 1mo ago Changed · +52 lines · +26 tokens per session ed8e4467348c
  6. 1mo ago First seen · 53 lines · 51 tokens per session scan A ca436cb0db84

Subscribe to this mod's changes

contextnest-capture is an agent published in the GitHub repository PromptOwl/ContextNest (21 stars, last pushed yesterday), licensed AGPL-3.0. It adds 94 tokens to every session and 1,716 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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